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Topic: Servo grinding issue (Read 510 times)

I am new here I am working on a robotic arm. I have 9 S777 servos (I didn't build the arm, so this wasn't my selection). The box they came with the servos says timing is between 1ms and 2ms (so standard). I have code that puts that signal out with a frequency of 50Hz.

Unfortunately, my servos are always grinding. They don't move from their position and instead make the grinding noise. I have varied the pulse width from 1 to 2ms, and there is no difference.

I connected the servo to an external power source (it's high power), so it always supplies 6V. The current spikes whenever I send a signal, and I don't think that should be happening. So I have everything disconnected...